Grate-bar.



UNITED A PATENT OFFICE.

CHARLES W. ROLIN, OF PHILADELPHIA. PENNSYLVANIA, ASSIGNOR 'lO HIMSELFAND I'IORAlE E. FRIWK, OF PHILADELPHIA, PENNSYLVANIA.

GRA'lE-BAR.

Specification of Letters Patent.

Patented March 17, 1908.

Application filed October 4, 1907. Serial No. 395,831.

To (lZZ whom it may concem:

Be it known that I, CHARLES \V. Roms, a citizen of the United States ofAmerica, residing in the city and county of Philadelphia, in the Stateof Pennsylvania, have invented a certain new and useful Improvement inGrate-Bars, of which the following is a true and exact description,reference being had to the accompanying drawings, which form a partthereof.

My invention relates to improvements in grate constructions and has forits object to produce a supporting bar so constructed that the distancebetween the grate bar seats may be varied to accommodate the differentgrades of coal.

My invention consists in the details of construction and manner ofoperation set forth in the following description and the accompanyingdrawing, like reference characters referring to corresponding parts.

In the drawings: Figure 1 is a perspective view of my supporting bar.Fig. 2 is a plan view of the grate bars in position in a furnace. Fig. 3is a transverse section, taken on the line 3 3 of Fig. 2. Fig. 4 is afraginentary view of a cross-section of one of my supporting bars inposition, and Fig. 5 is an end view of one of the supporting bars lockedin its bearing.

Referring to Fig. 1, A represents one of my supporting bars. This bar isrectangular in transverse section and has rows of lugs (1., b, c, and(Z, on each side thereof respectively. All the lugs in the same row havea uniform thickness longitudinally of the bar but the lugs in one rowhave a different thickness from the lugs in any of the other rows, thatis, the lugs (l in one row are thicker than the lugs Z) in the next row,and the lugs Z) in turn have a greater thickness than the lugs c in thenext row etc. The supporting bar terminates at its ends in cylindricalbearings B, B, one of which contains slots f, f, arranged at rightangles to each other in the end thereof, the purpose of which will behereinafter described.

In Figs. 2 to 5 inclusive, a pair of my supporting bars A, A, are shownlocked in end bearing seats C, C, resting on the lining E, of a furnaceor other fire containing chamber wherein grate bars are employed. Thesebearing seats consist of a flat base portion Zr, and vertical walls Z,Z, between which is formed a seat for the cylindrical bearing of thesupporting bar as shown in Fig. 5.

All of the bearing seats are of the same con struction with theexception that the ones supporting the slotted ends B, B, of thesupporting bars each have a slot through the side walls thereof, each ofsaid slots being in alinement with one of the slots in the correspondingbearing B. A flat key F, is passed through the alined slots in thebearing and its seat for the purpose of locking the supporting baragainst rotation. The grate bars E, E, are supported at their endsrespectively, in the seats formed between the upper rows of lugs c, onthe two supporting bars and, as heretofore stated, the distance betweenthcse lugs are uniform and correspond substantially to the thickness ofthe end of each grate bar. The thickness of each lug in these upper tworows is also uniform and determines the distance between each grate bar.

In order to vary the distance between the grate bars E, E, theselatter,together with the flat keys F, F, are removed, the supporting bars arethen turned on their axes until the respective adjacent rows of lugs (Z,(Z, are brought around to occupy a position along the top of the bar inthe place of the lugs c, (t. This brings the corresponding slot f, inthe end of each bearing B, in alinemcnt with the slots in the bearingseat U. The keys F, F, are inserted in these slots and the supportingbars are thus locked in their changed positions. The distance betweenthe lugs (Z, (Z, like that of the lugs (i, c, are uniform and correspondsubstantially with the thickness of the ends of the grate barsrespectively, which latter are between the lugs (Z, (Z. The lugs (Z, (Z,however are not so thick as the lugs c, c, and thus determine a lessdistance between the grate bars than the lugs c, C. The same operationmay be continued to bring the lugs Z), Z), into position between thegrate bars to determine a greater distance between the seats than thatof the lugs c, c, and the operation may be still further continued tobring the bottom lugs (1 (I, into position between the grate bars which,by virtue of their thickness, determine a still greater distance betweenthe grate bars than that of the lugs 6, Z).

By the above construction of supporting bars I am enabled to obtain agrate having a changeable space between the bars thereof to accommodatedifferent grades of coal, as, for instance, pea coal having small nutswould require a less distance between the bars than stove coal havinglarge nuts. It is obvious that I may use one or more supporting bars andthat the same may be adapted to other fire containing receptacles inwhich grates are employed, and further I do not restrict myself to asupport rectangular in cross-section nor having four rows of lugs aroundthe same, as supports of any cross-section may be employed and anynumber of rows utilized, provided the structure is within the scope ofmy invention.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is, V

1. A support for grate bars having a plurality of grate bar seatsarranged in two or more interchangeably used groups, the seats indifl'erent groups being spaced diflerently.

2. A rotatable support for grate bars having two or more groups of gratebar seats, each group of seats being at a different side of the supportfrom any other groups and the seats in different groups being spaceddifierently.

3. A rotatable support for grate bars having two or more groups of gratebar seats,

each group of seats being at a different side of the support from anyother groups and the seats in different groups being spaced differently,and means for locking said support in different operative positions.

4. A rotatable support for grate bars having two or more groups of gratebar seats, each group of seats being at a different side of the supportfrom any other groups, the seats in different groups being spaceddifferently, the said support having slots in one end thereof, a slottedseat for the said end of said support and a key adapted to fit in theslotted seat and one of the slots in the support for locking the latterin operative position.

5. In a fire grate construction, the combination with a plurality ofgrate bars of supporting means having grate bar bearing seats arrangedin two or more interchangeably used groups, each group being adapted tosupport said bars at determined distances apart, different from thedistances between the bars when supported by any other group of seats.

ARNOLD KATZ, D. STEWART.

